The Sony 20mm F2.8 is a fixed wide-angle prime lens for Sony's full-frame and APS-C format SLT cameras. Covering a viewing angle of 90-degrees on full-frame sensors, the 20mm F2.8 can focus down to 25 centimeters (9.8 inches). Optical construction comprises ten elements in nine groups, and in common with several other Sony lenses, autofocus is driven from the camera's AF motor.